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Multi-Way Conventional loudspeakers with crossovers

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Old 17th June 2012, 10:19 PM   #51
ODougbo is offline ODougbo  United States
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I did try these boxes once before with a different crossover and tweeter, they were terrible and ultimately gave one pair away (might have to ask for that pair back - or rebuild a second pair)

Easy to hear the crossover point 1,700 - 2,000.

If I make any changes, I'll use a toggles for AB testing.

For a small speaker, they have a bigger than life sound.
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Old 17th June 2012, 11:13 PM   #52
system7 is offline system7  United Kingdom
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I have to admit that I can fall flat on my backside sometimes. I'd forgotten that you are using a 4 ohm woofer, so 15uF and 2 ohms is probably exactly right.

What you have done that is so neat, is got the time alignment right:

Click the image to open in full size.

We had a good old diyaudio disagreement about series crossovers here:
Sreten & Speakerman go at series XOs

All you gotta do is get the highly respected Vifa XT25 tweeter sounding right. Don't discount using amplifier tone controls, because 3 dB here or there makes a world of difference, but you are doing VERY WELL, IMO.
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Old 18th June 2012, 04:29 AM   #53
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Sloped front, driver separation distance, proper time alignment if the correct crossover is used.
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Old 18th June 2012, 06:05 AM   #54
AllenB is offline AllenB  Australia
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Steve, you will reminisce about the good times

I'd have to agree with you that 3dB in the wrong place can be tragic.
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Old 22nd June 2012, 08:38 AM   #55
ODougbo is offline ODougbo  United States
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Can not find the matching pair of boxes; that would have been nice for AB testing. There is a pyramid pair that is close in size/shape; need to fit the tweeter in.

What do you think about dropping the woofer coil to .7 and keeping the rest the same? That's only about 6' of magnet wire.

Making the XO board on a 6" x 8" very thin box; will set the speaker on top of it.
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Old 22nd June 2012, 09:56 AM   #56
ODougbo is offline ODougbo  United States
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Took one of the pyramids apart - the xo was done by ear and un-raveling wire from a larger coil - we ended up with .75 (and 3.3 cap).
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Old 22nd June 2012, 10:57 AM   #57
system7 is offline system7  United Kingdom
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Quote:
Originally Posted by ODougbo View Post
Took one of the pyramids apart - the xo was done by ear and un-raveling wire from a larger coil - we ended up with .75 (and 3.3 cap).
I just ran that past the Visaton BoxSim, and that looks very good. Phase should be just about spot on assuming you're probably not quite exactly time aligned there.

You can swap the tweeter 3.3uF for a 4.7uF if you want 2dB more energy in the 2-4kHz range as I think you have realised. Reducing the woofer resistor to 1 ohm will affect phase (and imaging) more than anything, and I think you are happy with that.

So yes, I think you are there now. What do you think of the Vifa tweeter? How does it differ from the morel?
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Old 23rd June 2012, 03:29 PM   #58
ODougbo is offline ODougbo  United States
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Default Report

The vifa is a great replacement for the Morel and wayyyyy less $$. The Vifa seems to go a little higher, I guess because there's no ferro fluid in the Vifa (less to worry about with no ferro fluid).

Not to get off track...I did replace ferro fluid in few older Morels; not easy, they are not made to take apart.

The triangle speakers need some TLC, the drivers were routed way to deep, so fixing that now with wood rings.

Added a 1mf to the 3.3cap (oak pair), which are playing nicely, there is slightly more high end; don't think I need to go any larger.

(I do have 4.7 caps, will try that with the next xo).
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Old 24th June 2012, 11:55 AM   #59
ODougbo is offline ODougbo  United States
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Pic of new speaker base(s) with xo hidden inside; upgraded a few components also.

Will be trimming up and painting the triangle boxes soon.

(12uf on woofer)
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Last edited by ODougbo; 24th June 2012 at 11:57 AM.
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Old 24th June 2012, 02:27 PM   #60
ODougbo is offline ODougbo  United States
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I tried the 4.7 cap on the tweeter, gesh thought I did something wrong; very shhyyyy/whispery and bass was not as strong.

I replaced the 4.7uf with 4.0uf caps and they went back to the way they sounded yesterday (very nice/balanced).

Very surprised there was a huge difference with a small change.
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